It says i did not buy minecraft but i did a while ago.

First, I want to say that I am not a good writer so bear with me. So I bought Minecraft a few years back through my game band which it just brought me to the Minecraft website so I would think I would have it on my computer too, but when I go to Minecraft.net it has always said I never bought the game and I don't want to pay again because my game band is not working well.  So I was wondering if anyone else has this issue with Mc.net saying you did not buy the game.

 

the images at the bottom show that it says I don't have the game but there is an image with the game with my email too.